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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6222
Title: The effect of melt composition on metal-silicate partitioning of siderophile elements and constraints on core formation in the angrite parent body
Authors: Steenstra E.S.
Sitabi A.B.
Lin Y.H.
Rai N.
Knibbe J.S.
Berndt J.
Matveev S.
van Westrenen W.
Published in: Geochimica et Cosmochimica Acta
Abstract: We present 275 new metal-silicate partition coefficients for P, S, V, Cr, Mn, Co, Ni, Ge, Mo, and W obtained at moderate P (1.5 GPa) and high T (1683–1883 K). We investigate the effect of silicate melt composition using four end member silicate melt compositions. We identify possible silicate melt dependencies of the metal-silicate partitioning of lower valence elements Ni, Ge and V, elements that are usually assumed to remain unaffected by changes in silicate melt composition. Results for the other elements are consistent with the dependence of their metal-silicate partition coefficients on the individual major oxide components of the silicate melt composition suggested by recently reported parameterizations and theoretical considerations. Using multiple linear regression, we parameterize compiled metal-silicate partitioning results including our new data and report revised expressions that predict their metal-silicate partitioning behavior as a function of P-T-X-fO2. We apply these results to constrain the conditions that prevailed during core formation in the angrite parent body (APB). Our results suggest the siderophile element depletions in angrite meteorites are consistent with a CV bulk composition and constrain APB core formation to have occurred at mildly reducing conditions of 1.4 ± 0.5 log units below the iron-wüstite buffer (?IW), corresponding to a APB core mass of 18 ± 11%. The core mass range is constrained to 21 ± 8 mass% if light elements (S and/or C) are assumed to reside in the APB core. Incorporation of light elements in the APB core does not yield significantly different redox states for APB core-mantle differentiation. The inferred redox state is in excellent agreement with independent fO2 estimates recorded by pyroxene and olivine in angrites. © 2017 Elsevier Ltd
Citation: Geochimica et Cosmochimica Acta (2017), 212(): 62-83
URI: https://doi.org/10.1016/j.gca.2017.05.034
http://repository.iitr.ac.in/handle/123456789/6222
Issue Date: 2017
Publisher: Elsevier Ltd
Keywords: Accretion
Angrite
Core
Metal
Siderophile
Silicate
ISSN: 167037
Author Scopus IDs: 57097521600
57194522128
57131561000
36137863700
56338202100
7006433392
8732229500
6602710945
Author Affiliations: Steenstra, E.S., Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands
Sitabi, A.B., Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands
Lin, Y.H., Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands
Rai, N., Centre for Planetary Sciences, Birkbeck University of London, London, United Kingdom, Department of Earth Sciences, Mineral and Planetary Sciences Division, Natural History Museum, London, United Kingdom
Knibbe, J.S., Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands
Berndt, J., Department of Mineralogy, University of Münster, Germany
Matveev, S., Department of Petrology, Utrecht University, Netherlands
van Westrenen, W., Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands
Corresponding Author: Steenstra, E.S.; Faculty of Earth and Life Sciences, VU University AmsterdamNetherlands; email: e.s.steenstra@vu.nl
Appears in Collections:Journal Publications [ES]

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